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Ocean Systems Engineering
  Volume 9, Number 4, December 2019 , pages 369-390
DOI: https://doi.org/10.12989/ose.2019.9.4.369
 

Dynamic analysis of an offshore jacket platform with a tuned mass damper under the seismic and ice loads
R.K. Sharma, V. Domala and R. Sharma

 
Abstract
    Herein, we present numerical simulation based model to study the use of a \'Tuned Mass Damper (TMD)\' - particularly spring mass systems - to control the displacements at the deck level under seismic and ice loads for an offshore jacket structure. Jacket is a fixed structure and seismic loads can cause it to vibrate in the horizontal directions. These motions can disintegrate the structure and lead to potential failures causing extensive damage including environmental hazards and risking the lives of workers on the jacket. Hence, it is important to control the motion of jacket because of earthquake and ice loads. We analyze an offshore jacket platform with a tuned mass damper under the earthquake and ice loads and explore different locations to place the TMD. Through, selected parametric variations a suitable location for the placement of TMD for the jacket structure is arrived and this implies the design applicability of the present research. The ANSYS*TM mechanical APDL software has been used for the numerical modeling and analysis of the jacket structure. The dynamic response is obtained under dynamic seismic and ice loadings, and the model is attached with a TMD. Parameters of the TMD are studied based on the \'Principle of Absorption (PoA)\' to reduce the displacement of the deck level in the jacket structure. Finally, in our results, the proper mass ratio and damping ratios are obtained for various earthquake and ice loads.
 
Key Words
     anti-vibration device; parametric study; vibration control effect; seismic time history; dynamic ice force
 
Address
R.K. Sharma: L&T-Valdel Engineering Limited, India
V. Domala: RIMSE, CADIT Lab, Seoul National University, Republic of Korea
V. Domala: RIMSE, CADIT Lab, Seoul National University, Republic of Korea
R. Sharma: Design and Simulation Laboratory, Department of Ocean Engineering, IIT Madras, India
 

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